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-1u-6=2u-18
We move all terms to the left:
-1u-6-(2u-18)=0
We get rid of parentheses
-1u-2u+18-6=0
We add all the numbers together, and all the variables
-3u+12=0
We move all terms containing u to the left, all other terms to the right
-3u=-12
u=-12/-3
u=+4
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